Journal ArticleDOI
Constructal Theory Based Geometric Optimization of Wavy Channels in the Low Reynolds Number Regime
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TLDR
In this paper, the constructal theory is applied to optimize the geometry of wavy-wall channels of an electronic heat sink, where the objective is to minimize the global thermal resistance.Abstract:
To obtain better fluid mixing and higher heat transfer in the low Reynolds number regime, various wavy fins are employed in heat sinks (heat exchangers) for electronic cooling applications. However, it was reported in previous works that in the low Reynolds number regime there are no remarkable differences in the thermal performance of a straight-plate and a wavy-wall channel. In this study, the constructal theory is applied to optimize the geometry of wavy-wall channels of an electronic heat sink, where the objective is to minimize the global thermal resistance. The domain has three degrees of freedom: The interplate-spacing (S), the wavelength ratio (lambda(1)/lambda(2)), and the amplitude ratio (a(1)/a(2)). The two times minimized global thermal resistance indicates that the thermal-hydraulic performance of the wavy channels is unaffected by the amplitude ratio, while the wavelength ratio and interplate separation have strong impacts on the overall performance. In addition, the thermal performances at four Reynolds numbers are evaluated, and it is found that the constructal-wavy channels can exhibit much better thermal performance in the low Reynolds number regime. (Less)read more
Citations
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Journal ArticleDOI
Progress of constructal theory in China over the past decade
TL;DR: The developments of constructal theory about engineering problem in China over the past decade are reviewed to show that the developments of constructional theory are still being made in China, which will provide more design guidelines not only for engineering problem, but also for natural and social problems.
Journal ArticleDOI
Performance comparison of wavy microchannel heat sinks with wavy bottom rib and side rib designs
TL;DR: In this paper, a three-dimensional fluid-solid conjugate model is developed to investigate the heat transfer performance of the left-right and up-down wavy microchannel heat sinks.
Journal ArticleDOI
Constructal design of a blast furnace iron-making process based on multi-objective optimization
TL;DR: In this article, a BFIM (blast furnace iron-making) process is optimized by taking a complex function as optimization objective, and the complex function is integrated with HM (hot metal) yield and useful energy of the BF(blast furnace).
Journal ArticleDOI
Experimental optimization of geometrical parameters on heat transfer and pressure drop inside sinusoidal wavy channels
TL;DR: In this paper, the authors investigated the influence of the axial Reynolds number and wave amplitude ratio on the heat transfer and pressure drop of sinusoidal wavy channels with different phase shifts and found that the maximum heat transfer to pressure drop ratio is maximum for b / H = 0.54, N w = 11, φ / π = 0 and the corresponding value of η is 1.21.
Journal ArticleDOI
Heat transfer enhancement of symmetric and parallel wavy microchannel heat sinks with secondary branch design
Shuo-Lin Wang,Ji-Feng Zhu,Di An,Ben-Xi Zhang,Liu-Yi Chen,Yan-Ru Yang,Shaofei Zheng,Xiao-Dong Wang +7 more
TL;DR: In this article, a three-dimensional fluid-solid conjugate model with symmetric and parallel wavy microchannels was studied, and the results showed that the symmetric configuration yields higher Nusselt numbers than the parallel one, and it is especially true for higher Reynolds numbers and larger amplitude-to-wavelength ratios.
References
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Stirring by chaotic advection
TL;DR: In this paper, it is shown that the deciding factor for integrable or chaotic particle motion is the nature of the motion of the agitator, which is a very simple model which provides an idealization of a stirred tank.
Book
Design with constructal theory
Adrian Bejan,Sylvie Lorente +1 more
TL;DR: Constructal theory is the view that the generation of "designedness" in nature is a universal (physics) phenomenon that can be based on principle (the constructal law): "For a finite-size flow system to persist in time (to live) its configuration must change in time so that it provides greater and greater access to its currents" as discussed by the authors.
Journal ArticleDOI
The development of chaotic advection
TL;DR: The concept of chaotic advection was developed some twenty years ago as an outgrowth of work on interacting point vortices and was first introduced in the title of an abstract for the 35th annual meeting of the American Physical Society (APS) Division of Fluid Dynamics (DFD) in 1982 as mentioned in this paper.
Journal ArticleDOI
Fluid flow and heat transfer in wavy microchannels
TL;DR: In this paper, Wang et al. used the Poincare section to analyze the fluid mixing in three-dimensional wavy microchannels with rectangular cross-sections and found that the quantity and the location of the vortices may change along the flow direction, leading to chaotic advection.
Journal ArticleDOI
An experimental study of flow and heat transfer in sinusoidal wavy passages
TL;DR: In this article, local heat transfer and flow behavior for laminar and transitional flows in sinusoidal wavy passages are investigated, with special attention directed toward detecting the onset of macroscopic mixing in the flow.